Lifting-jack.



No. 850,209.4 PTENTED APR. 16, 1907.

v H. VBURKHOLDERl l LIFTING JACK.

APPLICATION FILED DEO. 31, 1906 JOHN H. BURKHOLDER, OF ASHLAND, OHIO.

Specification of Letters Patent.

Patented April 1c, 1907.

Application tiled December 31, 1906. Serial No. 350,133.

To all whom it may concern:

B eit known'that I, JOHN H. BURKHOLDER, a citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented certain new and useiul Improvements in Lifting-Jacks, and do declare that the following is a full, clear, and exact description of the invention, which willenablc others skilled in the art to which it a pertains to make and use the same.

y invention relates to lifting-jacks; and the invention consists in a lifting-'jack which is intended more particularly for automobiles and like heavy vehicles and in which both speed of adaptation and power in opera tion are desirable.

In the accompanying drawings, Figure 1 is a side elevation of my improved lifting jack, and Fig. 2 is acentral sectional elevar ytion thereof. F igi 3 is a cross-section on the line'of the pivotof the operating-handle; and Fig. 4 is aside elevation, partially in section, of the means for 'reversing the direction of operation either up or down, as may be required.

A represents the -standard of the jack, having a suitable base and tubular or hollow from en d to end and adapted to receive and o erate lift member B'. Said member is.

s own as inserted from the top of the standard and threaded in its body 4downward to its lower end and carries a guide-pin 2, adapted to run in a channelor groove 3 in standard A in order-to keep head 4 of the said lift member in right Working relations at all times with the other parts and prevent member B from turning. The sald member B y unite the top portion of the standard withv has threaded miter-gear C mounted. thereon in a recess -in Athe standard between lateral supporting Aand connecting arms 5,'wh1ch the bod-y thereof about the said recess. The weight coming on the said lift member rests I on the standard through4 Asaid .bevel-gear C,

and the said gear is meshedand actuated through the compound bevel and spur gear D, supported on the side of the standard A on short shaft or spindle d and upon which said gear Dis free to be rotated either way,

according to the direction of movement to be given hft member B. [I represents the operating or power handle, `which is loosely pivotedupon short.

shaft (l behind bevel-gear D or between Athe same and standard A and initsel 1s wholly independent of all the associated parts, but

vextremity of the pawl to be thrown into engagement with the teeth of saidgeai", according as rotation is to be had in one direction oru the-other. ,For example, if upper arm 6 be in engagement the gear will be rotated in one 65 direction', and if the lower arm 7 be in engagement the gear will be operated in the oppo site direction, and the said pawl is adapted to swing on its pivot and to be held in either engaging position by meansof spring 8, lo- 7c cated behind the same in a socket in handle H and engaged centrally with the p-awl at 9.

, It follows that if the pawl be'thrown either way the spring will hold it in that-position until it be reversed by'hand, andthe paw'l is 75y I adapted tobe engaged at its upper end 6 by the finger and held out of engagement with -lift member the pawl J is thrown into suitable engagement and further operations are 9o by lever vIn the present drganizati'on the jack` is raised by raising the handle 'but it mav'be reversed as to this and lmade to raise orli'it when 4 the handle is depressedfj By locating the 95 pivot of the handle insideg'of gear D, I am enabled to give the gear its own free rotation by its handle 10 in 'order to get the quick elevations above referred to.

Gear D has been referred to as having eomrco poundmteetinthe, same being beveled at d to mesh with gear C and straight in their outer portions d2 to be engaged by'pawl J, thus serving as ratchet-tooth in connection-'with said iawl. m5

Wliat I claim isl. A lifting-j ack having a standard with a vertical guideway inside and a recess in its upper portion and having the top of the l standard above the said recess and supported 1 ro by arms 5, an internally-threaded gear in said recess, a threaded lift member projecting roper elevation for use, 8o

tlrouh said gear and having its lower end l hollow standard for said parts and a spindle. zo -s idab standard, and an o erating-lever loosely pivf y engaged with said guideway in the oted on the side o the standard-neck below l said gear, a loosely-mounted pinion in mesh with said gear and a doublearmed pawl in said lever engaged with said pinion.

2. In lifting-jaeks, a standard having 'a s )indle rigidly affixed at one side thereof, a t n'eaded lift member" and drive-gear therefor mounted upon said standard, an operatinglever sleeved upon said spindle between the standard and said drive-gear andheld in operating osition thereby, a pawl on said lever ,Ldaptedp to operatively engage said drivegear, and a crank rigid with said drive-gear at the. outer side thereof.

3. In lifting-jacks, a lifting-screw and a threaded ruiter-gearto operate thel saine, a

secured to one. side ol' said standard, a conipound bevel and spur gear lree to rotate on said spindle and meshing with sai-id mitergear and having an integral crank at its outer side, a lever sleeved upon said spindle and having bearing engagement therewith-at the inner endlthereolr nearest to the center ol rest of said standard-and on the inside of said drive-gear, and a double-aeting pawl on said lever adapted to engage said compound bevel and spur gear. j

ln testimonir wliereol l sign this speeiiiration in the presenee ol'v two witnesses. i

JOHN Il;BllKllOliDlCli.

Wi tnesses: .y

l. IC. Coi'x'rlii-:Ynw, (lao. A. Xuon. 

